Update docs for 1.4.2 release
diff --git a/docs/dyn/gmail_v1.users.messages.html b/docs/dyn/gmail_v1.users.messages.html
index b712e94..a514067 100644
--- a/docs/dyn/gmail_v1.users.messages.html
+++ b/docs/dyn/gmail_v1.users.messages.html
@@ -139,6 +139,7 @@
   An object of the form:
 
     { # An email message.
+    "internalDate": "A String", # The internal message creation timestamp (epoch ms), which determines ordering in the inbox. For normal SMTP-received email, this represents the time the message was originally accepted by Google, which is more reliable than the Date header. However, for API-migrated mail, it can be configured by client to be based on the Date header.
     "historyId": "A String", # The ID of the last history record that modified this message.
     "payload": { # A single MIME message part. # The parsed email structure in the message parts.
       "body": { # The body of a single MIME message part. # The message part body for this part, which may be empty for container MIME message parts.
@@ -183,6 +184,7 @@
     The object takes the form of:
 
 { # An email message.
+  "internalDate": "A String", # The internal message creation timestamp (epoch ms), which determines ordering in the inbox. For normal SMTP-received email, this represents the time the message was originally accepted by Google, which is more reliable than the Date header. However, for API-migrated mail, it can be configured by client to be based on the Date header.
   "historyId": "A String", # The ID of the last history record that modified this message.
   "payload": { # A single MIME message part. # The parsed email structure in the message parts.
     "body": { # The body of a single MIME message part. # The message part body for this part, which may be empty for container MIME message parts.
@@ -229,6 +231,7 @@
   An object of the form:
 
     { # An email message.
+    "internalDate": "A String", # The internal message creation timestamp (epoch ms), which determines ordering in the inbox. For normal SMTP-received email, this represents the time the message was originally accepted by Google, which is more reliable than the Date header. However, for API-migrated mail, it can be configured by client to be based on the Date header.
     "historyId": "A String", # The ID of the last history record that modified this message.
     "payload": { # A single MIME message part. # The parsed email structure in the message parts.
       "body": { # The body of a single MIME message part. # The message part body for this part, which may be empty for container MIME message parts.
@@ -273,6 +276,7 @@
     The object takes the form of:
 
 { # An email message.
+  "internalDate": "A String", # The internal message creation timestamp (epoch ms), which determines ordering in the inbox. For normal SMTP-received email, this represents the time the message was originally accepted by Google, which is more reliable than the Date header. However, for API-migrated mail, it can be configured by client to be based on the Date header.
   "historyId": "A String", # The ID of the last history record that modified this message.
   "payload": { # A single MIME message part. # The parsed email structure in the message parts.
     "body": { # The body of a single MIME message part. # The message part body for this part, which may be empty for container MIME message parts.
@@ -317,6 +321,7 @@
   An object of the form:
 
     { # An email message.
+    "internalDate": "A String", # The internal message creation timestamp (epoch ms), which determines ordering in the inbox. For normal SMTP-received email, this represents the time the message was originally accepted by Google, which is more reliable than the Date header. However, for API-migrated mail, it can be configured by client to be based on the Date header.
     "historyId": "A String", # The ID of the last history record that modified this message.
     "payload": { # A single MIME message part. # The parsed email structure in the message parts.
       "body": { # The body of a single MIME message part. # The message part body for this part, which may be empty for container MIME message parts.
@@ -371,6 +376,7 @@
     "resultSizeEstimate": 42, # Estimated total number of results.
     "messages": [ # List of messages.
       { # An email message.
+        "internalDate": "A String", # The internal message creation timestamp (epoch ms), which determines ordering in the inbox. For normal SMTP-received email, this represents the time the message was originally accepted by Google, which is more reliable than the Date header. However, for API-migrated mail, it can be configured by client to be based on the Date header.
         "historyId": "A String", # The ID of the last history record that modified this message.
         "payload": { # A single MIME message part. # The parsed email structure in the message parts.
           "body": { # The body of a single MIME message part. # The message part body for this part, which may be empty for container MIME message parts.
@@ -445,6 +451,7 @@
   An object of the form:
 
     { # An email message.
+    "internalDate": "A String", # The internal message creation timestamp (epoch ms), which determines ordering in the inbox. For normal SMTP-received email, this represents the time the message was originally accepted by Google, which is more reliable than the Date header. However, for API-migrated mail, it can be configured by client to be based on the Date header.
     "historyId": "A String", # The ID of the last history record that modified this message.
     "payload": { # A single MIME message part. # The parsed email structure in the message parts.
       "body": { # The body of a single MIME message part. # The message part body for this part, which may be empty for container MIME message parts.
@@ -489,6 +496,7 @@
     The object takes the form of:
 
 { # An email message.
+  "internalDate": "A String", # The internal message creation timestamp (epoch ms), which determines ordering in the inbox. For normal SMTP-received email, this represents the time the message was originally accepted by Google, which is more reliable than the Date header. However, for API-migrated mail, it can be configured by client to be based on the Date header.
   "historyId": "A String", # The ID of the last history record that modified this message.
   "payload": { # A single MIME message part. # The parsed email structure in the message parts.
     "body": { # The body of a single MIME message part. # The message part body for this part, which may be empty for container MIME message parts.
@@ -528,6 +536,7 @@
   An object of the form:
 
     { # An email message.
+    "internalDate": "A String", # The internal message creation timestamp (epoch ms), which determines ordering in the inbox. For normal SMTP-received email, this represents the time the message was originally accepted by Google, which is more reliable than the Date header. However, for API-migrated mail, it can be configured by client to be based on the Date header.
     "historyId": "A String", # The ID of the last history record that modified this message.
     "payload": { # A single MIME message part. # The parsed email structure in the message parts.
       "body": { # The body of a single MIME message part. # The message part body for this part, which may be empty for container MIME message parts.
@@ -574,6 +583,7 @@
   An object of the form:
 
     { # An email message.
+    "internalDate": "A String", # The internal message creation timestamp (epoch ms), which determines ordering in the inbox. For normal SMTP-received email, this represents the time the message was originally accepted by Google, which is more reliable than the Date header. However, for API-migrated mail, it can be configured by client to be based on the Date header.
     "historyId": "A String", # The ID of the last history record that modified this message.
     "payload": { # A single MIME message part. # The parsed email structure in the message parts.
       "body": { # The body of a single MIME message part. # The message part body for this part, which may be empty for container MIME message parts.
@@ -620,6 +630,7 @@
   An object of the form:
 
     { # An email message.
+    "internalDate": "A String", # The internal message creation timestamp (epoch ms), which determines ordering in the inbox. For normal SMTP-received email, this represents the time the message was originally accepted by Google, which is more reliable than the Date header. However, for API-migrated mail, it can be configured by client to be based on the Date header.
     "historyId": "A String", # The ID of the last history record that modified this message.
     "payload": { # A single MIME message part. # The parsed email structure in the message parts.
       "body": { # The body of a single MIME message part. # The message part body for this part, which may be empty for container MIME message parts.